HALPERN GLICK MAUNSELL · halpern glick maunsell _,£ austeel ironoreproject predictionof...
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Transcript of HALPERN GLICK MAUNSELL · halpern glick maunsell _,£ austeel ironoreproject predictionof...
HALPERN GLICK MAUNSELL _, £
AUSTEEL IRON ORE PROJECTPREDICTION OF GROUNDWATER
LEVEL DRAWDOWN
AUGUST 2001
Aquaterra Consulting Pty LtdABN49 032 286 703
22 Bowman StreetSouth Perth 6151
WN Western Australia
Tel: (03) 9368 4044Fax: (08) 9368 4055
Project No. 132IE1Document No. O73—A
équaterraare predicted) the model does not account for the recharge to the basement rocks from infiltratingstreamtlow.
The results of groundwater modelling has“shpwn:
Pit inflows to be around 600 to 1,0O0m3ld.although sensitivity modelling has shown that this ratecould be as high as 1,600 male;
Drawdown impacts extend eliiptically in a north-south direction from the George PalmerOrebody. The 0.5m drawdown contour extends 3.5km to the west, 5|-onto the east and 15km tothe north and south of the George Palmer Orebody.
Significant drawdown impacts are not observed in the Fortescue Alluvium.
The most significant drawdowns are predicted to occur along the strike of the orebody where DuBoulay and Edward Creeks cross the Brockman iron Formation to the north and south.
Final standing pit water levels have been predicted to be below the base of the pit (ie the pit willnot refillwith water by groundwater inflow processes).
We trust that this report satisfactorilyaddresses the objectives of this study. Please do not hesitateto contact us ifyou require any further information.
Yours sincerely,Aquaterra
, Joe AriyaratnamGroundwater Modeller
~ ‘:5
r;f‘.I”on.;_l-tail ‘i
'Priyn’t:ipalHydrogeologist (Director)
Enc.
F:\jobS\132\E1\Reports\073—A.doc Page 5
FIGURES
Figure 1 —-Location plan
Figure 2 - Finite Difference Grid
Figure 3 ~—Conceptual Groundwater Block Model (within text)
Figure 4 -—Steady State Model Calibration
Figure 5 - Hydraulic Conductivity Distribution: Layer 1
Figure 6 —Hydraulic Conductivity Distribution: Layer 2
Figure 7 -—Mining Stages: Pre-strip and End of Year 5
Figure 8 -—Mining Stages: End of Years 10 and 20
Figure 9 -—Predicted Groundwater inflow and Cumulative Volume
Figure 10 ——Predicted Drawdown Contours: Year 5
Figure 11 —Predicted Drawdown Contours: Year 10
Figure 12 —Predicted Drawdown Contours: Year 20
Figure 13 - Predicted Drawdown »—Wells and Drainage Paths
Figure 14 —Sensitivity Analysis: Groundwater Inflow
Figure 15 —Sensitivity Anaiysis: Drawdown at Wells
Figure 16 - Sensitivity Analysis: Drawdown at Drainage Paths
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